Wei, Aimin
Wang, Ruohan
Wei, Kai
Dai, Chencheng
Huang, Yue
Xu, Pengfei
Xu, Juan
Tang, Hui
Zhang, Yan
Fan, Yun
Article History
Received: 23 July 2019
Accepted: 20 December 2019
First Online: 10 February 2020
Compliance with Ethical Standards
:
: The authors declare that they have no competing interests.
: This study was approved by the Research Ethics Committee of Nanjing Maternity and Child Health Care Hospital Affiliated with Nanjing Medical University (Nanjing, China).